SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f7ef647a439cd6b1440981ff7a84d334fd9aa6727759321c21af861b520e882' 
  AND token = 'QZ4oFHivvmzZEWEKmiQBodOaC6rx0fWJgYn3PGjXMLQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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