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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'dc62e8be0f5dbb2125cf3f1e8283b10186df18800cb14ae5be71a8d6f10b174c' 
  AND token = '6QJWTSK3L48w78b82Dj6Da2jB9B4kxgpR9Yusgzw/QA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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