SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e10074a93c16fae1d4d09dca30bfc85e5d5fb5220935ad56d46cdd6da01f2188' 
  AND token = 'R6935fnhIVzGzRvz5qq0KO5Blcs/2+mjpq/CKaZRFwU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00800

JSON explain

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