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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2be0412a8abec663cdd78b3edef27cfcadbf15ebabc98c9260c48c59b6788fc' 
  AND token = '+BEdJ6DutGYTvw/PrLHj/1/2VnVJWyJ4mIeuKBr8d2A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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