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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '178a7fbf9b8ad2df21f14741ab27450823686a858191478027f9e28c1fd8ace2' 
  AND token = 'vly3AtEQU2mYGi7qwHy/3c5XM9b3bOpUfMArbOAmwSY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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