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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1fb6478bcabf4b502416afdfd4e5c886d2876bfb3ebb56975b10a5c740fabc89' 
  AND token = 'AyJ0A/AV3rowufEr5Qgg9oRx6kII6txDOtyrcqESwb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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