SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '073ae63fecb613e4709db94d37326070875d4a097ec72146641f9bd4924129b5' 
  AND token = 'TgnGaC62ulUHBOMV1xGL5Pcqfo3jOHAJAO95yhxKXlY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00052

JSON explain

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