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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '284cfc31966b9c041999b2317c5dc4ec7ecd2f88f5ef9eea6517e5c579d19286' 
  AND token = 'iaZlym2FpNgyPj2axk2xU8u9w/UbjCHSmKJLowlpE0k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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