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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd5df7c3ec9bbd8e37b7dff4adfe6ee87860113f928bfeb4ddc33a34e32b07922' 
  AND token = '6bvIkG8gzlykdXRA4X2K2cxDKe5DeuAbmcPEC8e3RBA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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