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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7a5802a446deb20dd239290868d42f2f36f140aafc8dc9820534b56d7ea5a014' 
  AND token = '/Fr4rlo5abJ2JK186ZD7fyDfLXtfMZE1NARuGVVgHiA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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