SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '705d2ae8aef4c9d1ea5ddc762391e32830b1c4af4e4d2042fa39af9babc96936' 
  AND token = 'GKQgV0aUjPPUYawl2wdX2vTTvw/+ncyxmmCfbCluPYo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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