SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '09caccce820a6321bd875360c35ffcd0e52692f151d0aca8ac66a77a5e99c356' 
  AND token = 'dj8Ga3KXY/cQjZDQuO6HPpzHdhRppFbAqVyALmUU+vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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