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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7c845456c505963da24ce74930beee41ad8ca80ee371897bf18b51ac24424a1d' 
  AND token = 'vnbgO5I8m6NZIpWae33KgS7mp7JjgeyL0DWaoY8Yb7w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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