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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2808c83be4f20ef877cdc0c4d842c9b4013c636072f1e629f6c1083f6a87b900' 
  AND token = 'LsQiX0drouhE63Uz4y2mPjOOWRiWx2NTrhToL6tG9y0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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