SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b54ab706a8934b577d0ca22cd8b27b3eaef047684cf80a97e443c0fb39d82567' 
  AND token = 'h/Z/oxJRaQu3taagOHnPBu42K1HVNUPmdJDpBrG2uIY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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