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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0137f72c187760f9d0f1d8a9545baef79ed0a3950e4a29a8898f86c9f87ed455' 
  AND token = 'cQTw1GHUjft5SO1jkvacwfXBzM8oaxJfoyujTqVj2b0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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