Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a615d03ccccbfc8e4c52f943ce324ad16132828ef54aeb749dacf98e125bae5f' 
  AND token = 'JPsMjaKbfmDznxc69DzbyvF147FxxEsYgn0F7+E1Ty0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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