Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd0fda1e5c2753a2847945da4e97561094974164f5eb14cbf6f34260405ac58a' 
  AND token = '/JzAnwGp+N1D2MqMwtx3VUyRUTL/jaxMtqZPw5MAOd4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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