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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36b957977eefbcc0b96a7e12ca524f8bc9f5e0dfbabfbd35cd26469074e77823' 
  AND token = 'ievDERCy1qFO//LGTelmXDaDi9kWy6n1hPub2SDh5wI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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