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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '101afa4a5af90eb5d6a1c9abc28f2ea16efeca06c79e5c9af9fed9c7864d8118' 
  AND token = '8LU6eDkriEPGvf2gBvVbdC7wcJ5tpWoAvuHCWgSWi+g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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