SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '693b4705fb9faa20d966cccb7ec8aa08023773a8ea5c33502b880f90a21b77bf' 
  AND token = 'O7/+hh/fiHLKr5OGhnwdVS6QFaCHzWEuQVLYO/SEwxA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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