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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd1479177cf1ccd1b017c96a8ac4213466b41eb619bf50f45dd600ab84722a414' 
  AND token = 'Z1RW2UDey7GVU8tahrdbJ2t1cs+OhQCiUZ5kuybv/+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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