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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f4f34cb1d47d92ccd0add0094a87b7991c2414604d9440a2732b0feebae9f80d' 
  AND token = 'lBOHu32HIfd6/YkbxmFgPdxgnn9TWIYinl9M32wRbTg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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