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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e152e34e687a7707469150761dbc850d3d26d9d4ca6551c5f12127a4698d1c23' 
  AND token = 'cFC7N8A9pjU/6qug0KPJhlj5D6PrjctCFD5b9/CFFik=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00060

JSON explain

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