Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ac53049588c0432913924cdb54d313dc33099bf1bf818ef0626c4007205f4dc2' 
  AND token = 'EomXnQ4T2cZex3AaesbFlIgAplO2y69o38VhzX9Rqso=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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