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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '52bc98566233b121ac69f3c8e1e0be00ed82b928a9770b6e98814c87cd5d8925' 
  AND token = 'fapgf5gnTw4upt48pJLv7EhWI+ilRzaFzTqP9cL9PBI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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