SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0668c98a15902442a7cf488f8e717d08d887894617390980d3b195902e4c6f1' 
  AND token = 'zKMaJAHPYnHBDD6HljmgLxMputlHnmDGBpU/3i8dq94=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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