SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '60a32b5e91cce7fe74b71af1029307a90436477f632fbb568d76fd4f68201dce' 
  AND token = '25NLDbDYGCEzcAoBhWgiNvzyD86Mj/0DK6Aqgt+VJwA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00047

JSON explain

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