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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f8a367f2cd2de14a24f6c4ad5d93b9d2712c2ddc9a6f80be669b1a55e30390c3' 
  AND token = '65xoRFSOMBvc8AXj9BOT8c9q7o5ieJYgkn+h7awOMeA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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