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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67a67c137e17625955575ca668d51c1ec13daeeb9e38698f77f6d9c1cbf435d3' 
  AND token = 'HYrH6FN/RYxsRNjAzTbGTibGgOONI62w34IcsDglDIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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