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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '07e399c7135558dd7dc45a2fcc0066f43e34f7ab00f0ac0c8e20bf427df31c5a' 
  AND token = '4qc5FcIyJYBIIn/OGXCMPYU62Eb6agACqpNOCydbK0Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00035

JSON explain

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