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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9f9cbd75256bc7613d92a36a23697f715c23a28c4bcf19f815347883f2652c96' 
  AND token = 'Rgzmtd6nHAmLOZ/sncScUc7Oz2CgU2Lc2LlSvxbcG6A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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