Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3e4c95766830ce1c42e88eff8c7e75efaf51b111d328b56c77189cc114ce3b78' 
  AND token = 'LhChJDv5ImMVfqPdwaL1fBEIYIjJxPdXdTI+e0VR3AE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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