SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2e5b643bc84d8a8ecba5d27a57b40b66369e7305234f5da6905543f04cefb9de' 
  AND token = 'q06nIwSFn0gOG7X4GWlL5hGB/4jYUMKJoKG0/w4N6Pk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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