SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd7c79d114ad2964baa3fe0c7977d082d20e3fd5ccfa5d0ce589b23806457a41f' 
  AND token = 'gi4J/myfpAhwNOJrKIhX+EuGrspSX9MIgJ7bVfOzDgE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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