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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b3ea0220e1e0ea545eb832525efd3295cd53278fcc0918f24bfeea551f790916' 
  AND token = 'vI0CR6vG53+tNFRPnIbS2H5q+jcm6J82gwWn12/IkS0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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