SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1308a9bf3c826b0bb3d5fec9a7c5aee3435716f717860ee6a17228cb793ccf77' 
  AND token = 'r+JuDVhUk04EqCzNZNX8/U9+hlFs0S5K5wr434ddyUg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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