SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1f8462dca4d563dec32d9e5fc03dca07f684fe7c63eba10eb8ed69b15be51e7e' 
  AND token = 'drCDKZHhkg73Bi7Ee/fYWZc8Rv/Wn4zW8jOkkUOwp0w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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