SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '05ae2a15224d83f2c5198c59b78d38ae8fa51629e044216224034b4640595657' 
  AND token = 'oKuF89QVw6RB8rojo7+UeQWH0/ZaghnyvdHLLpaEqsw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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