SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4512bdfde7252420cdcba069c651815029336344b80c4459c406ae7c7a246b5c' 
  AND token = 'ALTmpGiKKnxdBO248UhhzX6bYgbIGZtxPwg5pjZMsD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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