Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0df487a1b3b107264b66a1053e8a80d327e53453fcf660461a935bb54da4b00' 
  AND token = 'ZcB134TTwNlZu9YK+NUMy4kF7hUU/hWUdngMFvhj0Ck=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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