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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e1d56d4e78473d724a80bd3a46b5d4b9a6d3585a77f0ded50cc4bdee001ebffb' 
  AND token = 'UiKMVCZCJrXU2cQtVREFsjobryH17+OpiC+ktnvU+J8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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