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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9157bf24f649a124b882afe2bfbae87bc4f211418167d0db241bd44b8c5511cf' 
  AND token = 'M5unHXjGYh09Ww/7DWony85tYs4s+J73yQnzh+V+yDo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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