SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4958f86523afc5a94f251ce58031639b60da6379076b4e07ca959fc521761e36' 
  AND token = 'KVyBAqV/qMZ76rWFnIljCrB4iHgrvSiGwsVoDwSv57o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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