Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '040054bbf10fe468361412d3a5b17390928ce5b4e7e1971fbe2b71ea7553d756' 
  AND token = 'x4xnXHcf1XlhhYW4LWB+scz8gy24RLXbSkMPdFKMjlI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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