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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '55ae60b1c6430df030dfa86e53e067dc7bb1b1abbc4bc9bd2638b6f71efa7fe4' 
  AND token = 'e/6wQLGx6ABCeEWVvrTnG3fGXx22Hn3Rpr0HXOgSUe8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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