Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '792fdd16cd3686c2e6cd70cb6dce6ee4418640f95d16ae4af5927417448d0794' 
  AND token = 'pXJbGU4UjM1gtGQ1j+//8KoSM6eypoZo9EG7GhJcV9I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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