SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd533862722225cc25fdfced98fe047b01c29f1f0059fce8576cd3a3f38c9a88d' 
  AND token = 'RXBArjqiHsLzr+v0l9wRoLMXmB/GQxlVS5UFAAWhvV0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00048

JSON explain

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