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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '168a28566ab5a4a03a8fc6a88c40b0ac6181a3a6f550882c35701299a58aa095' 
  AND token = 'K97GYl+aPgV4a7rImKgXsaGXCbReiVkD5K2JJKDYHvA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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