Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd784e4cfdc6549c8e1d8bb3e4676774750c53032d94e45c623e9340786ce2737' 
  AND token = 'DJhRd1aJDWCO494XqhWa8nqa+HyBph5BObC+/DxCRKI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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