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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1dbbb79e91b5831eca3d846bda13038f72a5e15c92e78965d83bf1857513bab' 
  AND token = '7+E6BkPyoXefh8x1FtJmVxr/17IjDp+h5ljAVIvGc+U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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