SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1e636e80b73f42e93f171d4e86f1c3b709abf4933c9127a17558e2721f1b692' 
  AND token = 'JJJvroFYJXIyrFNVwMZZuvOlvwqCtKmvuPgVJ6OFNng=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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