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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3d3ce50bfa69297e3f6a74e4bfd21f51b4583d48e0c366dc54a03c5d9b8fb6' 
  AND token = 'tlmbJFu/p1iLwawNnt2dufhaT+0ovVM6Z51PDxRtTl4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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