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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '779b579b4e1392e2f4b8f1c0d4544941e9a5493c7244041ddcb25d541c93762d' 
  AND token = '1Xez9O56ZtV8XLq9uuK0h3MvLi9Hgg2yJVCnbOSUXSo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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