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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '47dd685be836ea6a0e4964928e6cff9cc860b548bada5c14683cbebe2852ca5d' 
  AND token = 'XLRBnjshfzVY6uSo6eI8Uns2tRIc84KAKmySZxmt3iQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}