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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1bda01bd3661bd1a6d91f3b798f93b86647abc674c4bb591057f4e61c567ad4e' 
  AND token = '4S+5HE9ijHGcZlwiGr+qFL2DuZSr7/ciI10mTPoCcZE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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