SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd53688d9264f5a4ea2fc66a8190972302c75a4b52622bbf3e91a12982e9c87a6' 
  AND token = 'BGT8KJJNb2eKI3Kjlth4Fg1BZNnDRYX9jnPJIj6yqJ0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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