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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f8b95535f6156f172a93abbe693f5c0044e8335f79882b0ff02544c0b76eb1b' 
  AND token = 'NZ9WcQ0WpE4gBJe64MoIKhGEKv1K1hnwdFLCQQoKysE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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