SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '099a56616e6c8ecbd783547a60f2057ed90fb0e32a5ea0a645634f92e1654f2c' 
  AND token = 'uIOaTB/SvaFVXMvdr5qltpZShEFbCLKnmw1GCEVvJ2I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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