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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7f90e83b9dde5b429a43ba828b788386d34fc3b9b163ab682efd152b1d9d3a36' 
  AND token = 'NyXMysMACoDZpyug5skZh8lgxYzYVmaJtyim2L9FN5w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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