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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd57ff7e763381299b8cabea8d9e3eefd020155ee60faf3433339f2dd04b9492e' 
  AND token = 'dFttE5UYHZbwu6PG87nIjkg261pLEBis2b093zM7t6M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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