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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'abaf1cd514c11235b870c952faf37eba51a4ebdf1bbc998805076f0b6cd1cd43' 
  AND token = 'BmfPydsLCbT56NLlxbv+mGnac8YmyFbrtBqdi+JZx6Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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