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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b611207d0fcae4ce6d5f3222e7447ceb13fca1867e250a50dbfce79f443f1482' 
  AND token = 'WW+ZhL1KPJkXeJLov7F3lzEx5tVN+5qME6Ca+79dfg4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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