SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284962ae45958613c9cf978d73c9f58e155d0502ccc0e6e9dddc7b78de2fc3f1' 
  AND token = 'Uqk6LvMurUMGWvbvz3CRKrv6ZFKs/jYoHz1EmTA9rCw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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