SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4be179e0993a9c8d275a10928f218f9dcf7fe847dfd23392646edba308bcc32f' 
  AND token = 'xRxLbtUwuqp9Lsigj7k54mB96Y8gXmKqlkJnwqMYRWk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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