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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b5da7ac6e640a55441e1bc4f602bbd76f29d2a7ef2f6ac4aeed4d9a4a10d2fb' 
  AND token = '72T9TBGJkSagDowJaDOZTFlui/Fe5wfZLZlEBSNwZQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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