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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '00a1c981e6cfa70b06cd8d1ca100924a0ccb70e0499f24e0d8de4f4c3db41467' 
  AND token = 'fKTvkK0bjw8raxWR340+6mQm1er87gPXEp/dJbV0b90=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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