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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '2f4c3d0ba8a7f4cf64c8be99b00f7377959577ecf5bd0c03e33f42e6c530200a' 
  AND token = 'upWUlGxRzopjI59BojhDi9vG2EZ0WmWy3S5Oisat7HA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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