SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '513f8196020b4e0d48b2d23148654dcf43b30b20c86f5a57ba1711f7bc4b3626' 
  AND token = 'a9ynv3gR6VN+jqC5hI3Rlpp6YjUD/+NTp+BWZjf1hRI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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