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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f1844c540ff578ba5c562e259860a4f7a263c2907fccb15bb004d4adbffe2be8' 
  AND token = '4h70v0T89WL49HIdK628OHJb11xLwtpMHEKtO3xuvgQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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