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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b2847494c6f7fa8fd0fa87629254afa3b8912dcb8a0050ab612258299e94aef1' 
  AND token = '6oVDEihaY83VipyM1VWIDHL6deDVvSlw25gPRXRA6XE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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