SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e3166106387d431f34a089e9c93561f6650f8d6cd97de5563ba9711a7e53e48a' 
  AND token = 'xGzYLP42KtOiRgZgQ37bIPrs/8hngJmGxfuSUZW/tWI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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