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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1019dfc8e0216ab86c7aab03e7e39c998503843ffd17305ba48d7222c1a1c89e' 
  AND token = 'xCksgRl/xjUssaw1lg0ig6ocoNxsIyK7Fupja/jUTGs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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