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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0012ab0427e60fcbbd4f429923a566c43eac01dd26b9c0a66f45ef2aefa8c46' 
  AND token = 'LZRudssfxihPl/PAWB3uid7+YQI1QGpcIYVJyEGP1ug=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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