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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ddfc00e10428989068fc76c6c5c5277bd1fe429b943a43e61950d47bb51d0930' 
  AND token = 'QRVmGIOXfTVCuRikIk5y7XFsovL3H+kgxfOSVX7vMvs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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