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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6c7d084992f9c501d142c0df1274712eb737162d1d98c6083ffde6c14457d9de' 
  AND token = 'zgOKkPS30aiRyKb7WyijI+vFIdfdSSNZeXQQXrI9bjo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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