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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0205965ae0aab091f4dfd04eca20d92b1e1c56db6559ec74ca1fcec527010fd4' 
  AND token = 'JKbSDyQQqVmnMl2B8Zcs5Kwg8/pk8Swpl7qdVVROFW4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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