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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5813d9f8eacd9170e29ca92f64c82885ffbab7837598e75ae90e5614a98885c4' 
  AND token = '82OuQq1yVaJYve6hw4w+cVuxOC6JMq8cWzcpO//Ywv8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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