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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7056279150666bebba85036b648bb569e7f1a6aeb949dfde97faaecc80f9133b' 
  AND token = 'PBgUt41GUDy9EhaDaUTPEmS1u9EQBJOTI1ptPiCreZw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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