Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bb6f91a18c61c336fd864ac08d1564fc04148dda2aeb567eba2fe2d4a0856485' 
  AND token = 'xe4NxONml7MnvuBtuR1MSnz1GALD/dv6ZcRTfxBtL/4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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