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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e86f4ae19336afa2a8f183c2ce386883835b4f093682d8d560fa79194dbb6643' 
  AND token = 'AGUw/uZ24JJeqSG46luaxu4g+jytv9wbP4F8/qt3pxo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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