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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '62e73ee83879ec9302df5a173f8ed644ed9d1c41958bd80e94c958f98105e81e' 
  AND token = 'ymgpnbDDkIRRgH1tg2QlPoi5D2PTvx04w4XDBV4O9+k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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