SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5d41e187bcd0a66a162895031b3b25c88910f0c6f08ef83d06a47cf17b040124' 
  AND token = '/NoYCtT8NS2MjZm1PGhPV1+J/oiXqDrgxgzNwdUVlhU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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