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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a37da1d4fc641efdfa8b639086d276b75a5c15efb3bb6f71980d8dbe988fb967' 
  AND token = 'TUHWE4LC+ARAVcSxZz9uRt6Eqj+r9d3B33v0BMNCGAY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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