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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '98d0ddfb2083be690ed67fbf3f7b29fae2ed594025bd66c1e446c2bb8a033d38' 
  AND token = '3iC/vyu/KD+Oo0IUe2bteNUrvcy2uZ9X0OKGw1pcQ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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