SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b007255c3b857fbdab80aa607b0f705a04d20fdfaf7b6e14f647b19d32759de1' 
  AND token = 'Eh/LcSBDzjLlZ79J+oqwBCwl5ioMsCfovu4NkOz4soI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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