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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6fe13f2125a3c9a7d24ac9286614e714e08d014ebe055a9589496e1b7cb4aaa7' 
  AND token = '3OIysf7cn/o0EVv0Magn0HdwNozPZtMCWqPr8jN4uxc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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