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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd8bfee72614de155764b60e6777c61d7805e486ef4b7a44aa2a87773d445063c' 
  AND token = '44O4D1kQsplQCSGZkyjsQbSMfVBINL2p4V9Mv0MBDrI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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