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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0d6cafb19bfc743edb52621f1c225c6a3e6c86e7b5cac18da93562acb5ae896' 
  AND token = 'Xm0T216V9Ub7tQeCEGQrKTeJKpTvyVBq9kbXvpjSQPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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