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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12b9bede402b98b5ed7ffb943f404b16c0c823539397b1a52514f5b6513c1530' 
  AND token = 'rjurtE8D4C4yiG3JmAjwS+P/2R1b+Hi36AA1yuJl86s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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