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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '063c51810bb8e32a95da04b486695b7050466667f082c0f96ff46971e31825e1' 
  AND token = '/vXO36H4C4y5hk8kFdQtEG9TaA6PrUAr8pO/Upc0oD4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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