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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd06c9a7ee5e7da6457a7ee6aa33e2bd0d1682fa9e2926bfb9c92d12a1d686079' 
  AND token = 'Y1/mjxI9NLJFNb/+hWcOe1jMznrKWeAXaCofdF5f9vs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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