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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8dc0ee494d79735bb776dc938c6fcff5115f997feae4400d075c4fe303c3350' 
  AND token = 'BnuC0FHWdGuu+f8xwwxp93F7r7wrW6I0qekIUw09tgs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00057

JSON explain

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