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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd55c1c59dbd43b41ed923fe429a5f9466c58307f9670bac26c48ceb0bf0ee81e' 
  AND token = '4QqiYFjukl2bz1buEJUReIxszLNKtSDX3lfVH3aBt28=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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