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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '02c4ae7e9e9c71dd1c81a15065d7b0773817cd20b99e34af66b8b20810f663f3' 
  AND token = 'LZEa1+gmafiA2DZlht4KNRuEErRyTww0sK1vTQjVTvg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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