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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4bc7db7246fc297b8bdf6f5a9098aa4ec202b5ca78785e1ab85b8c81813e04f' 
  AND token = '1xasjKEsEu6WNpyYBnZEF7ShwLln5PVB3yaf6kMiZGU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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