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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b773a584a4c6d9cc7ef1de63c7b5c61ff8883b6127e2d0e88aa17138ee9f333' 
  AND token = 'zcXFesCqcfpmB3Q+G35xOrznl5/MJzH0H3bI/gv5yU8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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