Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '971729bfe005c6c5e39956aa759931a29d3613543f2452d8056a3add174cce90' 
  AND token = '+uRnNtYhTT390LhMhbVw9m4MpeC0SFHTUVWtvDjUOtI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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